Yim yam cuam tshuam rau qhov attenuation ntawm RF coaxial cables
Lub attenuation ntawm RF coaxial cable yog hais txog qib ntawm lub zog poob thaum cov teeb liab kis tau los ntawm lub cable, feem ntau qhia hauv decibels (dB). Attenuation yog cuam tshuam los ntawm ntau yam, thiab tsab xov xwm no yuav piav qhia luv luv txog yim yam no.
1. Cov khoom siv raw
Cov txheej txheej rwb thaiv tsev ntawm RF cables feem ntau yog cov qauv foamed, thiab qib ntawm foaming yog ib qho tseem ceeb cuam tshuam rau dielectric attenuation thiab cov yam ntxwv impedance ntawm cable. Ib qib siab dua ntawm foaming tuaj yeem txo qhov dielectric tas li, yog li txo qis dielectric poob. Tus neeg xyuas pib sab hauv yog lub luag haujlwm rau kev taw qhia tam sim no, thiab nws cov khoom siv, qhov loj me, thiab qhov zoo ntawm qhov chaw txhua qhov cuam tshuam rau tus neeg xyuas pib poob ntawm lub cable. Txhawm rau kom tsis txhob poob, tus neeg xyuas pib sab hauv feem ntau yog ua los ntawm cov hlau uas muaj hluav taws xob zoo heev thiab kho nrog txheej txheej plating txhawm rau txhim kho nws qhov siab - kub tsis kam thiab lub zog siv tshuab.
2. Voltage Standing Wave Ratio (VSWR)
Qhov sawv yoj piv qhia txog qib ntawm kev xav sab hauv hauv ib kab. Thaum cov qauv cable tsis sib npaug los yog tsis sib haum rau cov khoom thauj, cov nthwv dej sawv yuav tshwm sim, ua rau qee lub zog rov qab los thiab ua kom lub zog poob.
3. Outer conductor
Lub luag haujlwm ntawm tus neeg xyuas pib sab nrauv yog tiv thaiv thiab tiv thaiv tus neeg xyuas pib sab hauv los ntawm kev cuam tshuam sab nraud. Txawm hais tias qhov kev xav tau ntawm cov khoom siv hluav taws xob sab nraud tsis nruj raws li cov neeg siv khoom sab hauv, nws cov txheej txheem tsim thiab kev tsim khoom tseem muaj feem cuam tshuam rau kev ua haujlwm cable.
4. zaus
Raws li kev khiav hauj lwm zaus nce, cov nyhuv ntawm daim tawv nqaij yuav tshwm sim, ua rau kom txo tau qhov zoo ntawm tus ntoo khaub lig-sectional cheeb tsam ntawm tus neeg xyuas pib thiab ib tug nce nyob rau hauv tsis kam, yog li ua rau ntau dua conductor poob. Ib txhij, dielectric poob kuj nce linearly nrog zaus.
5. Cable ntev
Qhov ntev ntawm lub cable, lub teeb liab mus deb, yog li tag nrho cov attenuation yuav nce raws li.
6. Kub
Kev nce hauv qhov kub thiab txias ua rau muaj qhov nce ntawm cov neeg xyuas pib thiab qhov loj dua tangent tus nqi ntawm lub dielectric poob lub kaum sab xis, ob qho tib si ua rau cov teeb liab ntxiv attenuation.
7. Khoov thiab installation kev ntxhov siab
Yog tias kev khoov ntau dhau tshwm sim thaum lub sijhawm teeb tsa ntawm cov cables, nws yuav ua rau cov qauv sab hauv puas, ua rau muaj kev poob qis hauv hluav taws xob, nrog rau kev txo qis.
8. Ib puag ncig tej yam kev mob
Ib puag ncig yam xws li av noo thiab raug tshuaj lom neeg kuj tuaj yeem cuam tshuam tsis zoo rau kev ua haujlwm ntawm cov cables, xws li corroding tus neeg xyuas pib sab nrauv lossis hloov cov yam ntxwv ntawm cov khoom siv rwb thaiv tsev.
Lub attenuation ntawm RF coaxial cables yog qhov tshwm sim los ntawm kev sib xyaw ua ke ntawm ntau yam cuam tshuam. Kev nkag siab txog cov xwm txheej no tuaj yeem pab xaiv cov kab hluav taws xob uas tsim nyog thiab siv cov kev ntsuas tsim nyog los txo cov teeb liab poob. Piv txwv li, nyob rau hauv siab - cov ntawv thov zaus, xaiv cov ntaub ntawv nrog cov yam ntxwv poob qis, ua kom muaj kev sib raug zoo impedance los txo qhov kev xav, thiab muab kev tiv thaiv tsim nyog hauv ib puag ncig hnyav yog txhua yam tseem ceeb.
